Chilled roll and method of making same



UNITED STATES PATENT OFFICE 1,948,245 CHIILED ROLL AND lWE'IHOD OFMAKING SAME The present William H. Seaman, Hammond, Ind.

No Drawing. Application May 3, 1930, Serial No. 449,688. RenewedDecember 11, 1933 4 Claims.

invention relates in general to a novel alloy of iron for use in achilled cast iron roll employed for rolling iron,

metals.

steel and other One of the objects of the present invention is toprovide an alloy iron of such character that when cast in a chilled moldwill give throughout the chill depth a sclerescopic hardness of from Afurther object is to provide an iron alloy roll in which the chill is ofsubstantially uniform hardness throughout its depth.

Another object is to provide an iron alloy roll in which the depth ofthe chill may be varied as desired.

A still further object is to provide an iron alloy chilled roll whichmay be used in cold rolling.

Still another object is of this character which may entirely for thecase hardened forged at present employed in to provide a chilled roll besubstituted steel rolls cold rolling.

Still another object is to provide an alloy roll of this character whichwill wear longer, give more uniform results necessary for this class andbe very much cheaper than the case hardened steel of work.

rolls heretofore There are other objects of my invention which togetherwith the foregoing will be described in the detailed specification thatis to follow.

It has been exceedingly difficult heretofore to make a chilled cast ironof sufficient hardness to alloy roll which would be be employed for anycold rolling work. This necessitated the employment of a forged steelcase exceedingly expensive hardened roll which was and in which it wasdifficult to secure uniform hardness throughout the surface of the roll.Furthermore, a case hardened roll of this character is soon as the rollwears short lived in that as sufliciently to penetrate to be discarded.Rolls of this character cost as much as $1.25 per pound.

Consequently, in view of rolls was exceedingly eximproved alloy of ironis suitable to work done by these pensive. My

the above objections the be cast in chilled rolls and will give asclerescopic hardness of from 90 to depth, which may be co quantity ofthe constitu 100 throughout its chill ntrolled by modifying the entsemployed.

The general characteristic of this iron alloy roll is a very high carboncontent, the effect of which is to increase the siderably more graphitiinterior of the roll.

hardness. There is con- 0 carbon in the gray iron The roll is alsocharacterized by a high nickel content, which increases the hardness andin comb ination with the carbon renders the chill of uniform texturethroughout its depth. A very low chromium content is also present, beingless than 10% of the nickel. The chromium, in conjunction with thecarbon and nickel, produces an alloy which when cast in a chilled moldprovides a roll that is exceedingly hard and tough throughout the depthof the chill, as well as being of uniform texture, tough and resilient.Furthermore, the bond between the chill and the gray iron interior isvery close.

Of course, in addition to these main constituents there are the usualalloy elements of manganese, silicon, sulphur and phosphorus in suitableproportions. The proportions of the elements of the alloy in addition toiron, to obtain a chilled roll having a sclerescopic hardness from 90 to100 with the characteristics set forth suitable for substitution inplaces now requiring I (-Ccrbon may be as high as 3.85 in specialinstances where more chill and somewhat greater hardness may berequired).

This alloy is cast in chilled molds in the same mechanical manner asordinary chilled rolls. The result is a chilled roll having asclerescopic hardness throughout its chill which is of considerablygreater depth thanordinary, of from 90 to 100, and very strong and toughthroughout. This roll will wear longer and give better service thanforged steel rolls. This'follows not only from the hardness of thematerial of the chill but from its uniformity and depth. The cost ofmaking the cast roll is much less than the cost of a forged steel casehardened roll and since, as outlined above, much better results aresecured than with the forged steel roll, the work product is moresatisfactory and very much cheaper.

The life of this cast roll is also very much longer and the rollpresents innumerable advantages over the. forged steel roll, as will beapparent to those skilled in the art. Rolls of this character may beemployed for cold rolling 105 wherever it has been necessary heretoforeto employ forged steel case hardened rolls. I

My invention may be variously modified without departing from the spiritand scope thereof, as set forth in the appended claims. 1m

Iclaim: 1. The method of making chilled iron alloy rolls which consistsin ensuring a chill by using small quantities of silicon, manganese andchromium and securing hardness of said chill by employing carbon andnickel from about 3.25 to about 3.35 carbon and from about 4.75 to about5.0 nickel.

2. The method of making chilled iron alloy rolls which consists inensuring a chill by using small quantities of silicon, manganese andchromium and securing hardness of a varying degree by using carbon andnickel in varying amounts from about 3.25 to about 3.35 carbon and fromabout 4.75 to about 5.0 nickel.

3. The method of making chilled iron alloy rolls which consists inensuring a chill by using small quantities of silicon, manganese andchromium running from about .15 to about .25 silicon and from about .25to about .35 chromium and from about .15 to about .20 manganese andsecuring hardness of said chill by using carbon and nickel as desiredfrom about 3.25 to about 3.35 carbon and from about 4.75 to about 5.0nickel. 4. A chilled iron alloy roll containing small amounts ofsilicon, chromium and manganese to ensure a chill, said amounts runningfrom about .15 to about .25 silicon and from about .15 to about .20manganese and from about .25 to about .35 chromium, said roll alsocontaining substantial quantities of carbon and nickel to securehardness of said chill, said carbon running from about 3.25 to about3.35 and said nickel running from about 4.75 to about 5.0.

WILLIAM H. SEAMAN.

